Here's another question from a visitor to the site:
"Neurology and Psychiatry: ...I continue to read the scientific literature and I find it somewhat arbitrary how different fields are divided up. What do you think of joining psychiatry and neurology?"
The field of "neuropsychiatry" is extremely interesting. At UBC there is a specialized ward devoted to helping patients who suffer from a combination of neurological diseases (such as epilepsy, head injuries, etc.) and psychiatric illnesses. Some "neuropsychiatrists" have completed specialty training in both neurology and psychiatry. At UBC a particular focus in neuropsychiatry has been the treatment of severe somatization and conversion disorders: these are psychiatric illnesses which present with severe physical or neurological symptoms (such as paralysis, blindness, or seizures). In conversion disorders, symptoms such as paralysis, blindness, or seizures, are not caused by neurologic problems such as stroke or epilepsy, but by severe, complicated depression in most cases. Treatment of the underlying psychiatric illness causes the neurological symptoms to disappear.
So, neurology and psychiatry do have an intersection in current practice. However, many neurologists may not be predisposed to dealing with psychiatric problems, or may not be willing to offer the type of regular follow-up which I believe is a healthy standard of care in psychiatry (unfortunately, the same could be said of some psychiatrists). Conversely, most psychiatrists would be uncomfortable dealing with acute or esoteric neurological problems.
So, in practice, while neurology and psychiatry have an overlap, the areas outside of the overlap are sufficiently large for the specialties to exist separately.